Process of rolling sheets



Patented Dec. 1, 19,31

' UNITED STATES PATENT OFFICE WILLIAM STRINGHAM, or FRANKLIN, OHIO, ASSIGNOR TO THE AMERICAN ROLLING- MILL COMPANY, or MIDDLETOWN, OHIO, A CORPORATION or OHIO rnocnss or ROLLING snnn'rs No Drawing.

My invention relates to a process of rolling sheets in which the product of a continuous rolling 1process is. utilized as pack forming to successful rolling of a sheeted product in a series of mills each of which give one pass to the piece, that the piece during rolling be given a convex cross sectional contour, not visible to the eye, thus permitting the most adequate application of roll pressures and providing for safe central feeding of the product as it becomes thin, from stand to stand of rolls. As Tytus points out this convexity of the piece is reduced in each stand by so arranging the various factors making up the active pass in the several mills that the center of the piece is reduced in thickness more than the edges.

My process deals with a special manner of utilizing thin sheeted p the Tytus process of rol ing, in the rolling of sheets in packs.

In rolling on the hand mill, or finishing mill, as it is also called, a pack of a number of pieces which have a convex contour in cross section, it has been considered necessary by Tytus to form the pack so that the pieces of which it is formed have a direction in the pack, which is alike to the direction in which.

the pieces forming the pack were rolled. In this way the convexity of each piece forming the pack, lies over the convexity of the others, producing a pack of considerable overall convexity, which is easy for the hand mill operator to roll in his mill.

I have discovered a method of finishing the continuously rolled pieces of convex cross section which does not require the particular final treatment specified by Tytus, my discovery having application to certain special cases, as will be set forth.

The advantage of being able to assemble and roll packs from continuously rolled sheeted material, so that the packs are rolled in a direction at right angles to the direction of continuous rolling-0f the sheet material, is that the width of the finished product can be the rolls may be broken. roduct produced by Application filed March 5, 1929. Serial No. 344,589.

varied at will, irrespective of the width of the sheeted material.

Thus a sheeted piece several hundred feet long and three feet Wide, can be cut into short pieces, say five feet long, which pieces are then finished in the hand mill at right angles to the preliminary rolling, thus producing pieces which are five feet as long as the thickness of the'original material permits.

The difiiculty of rolling more than two pieces in the-manner last indicated is that the convexity of the pack formed of more than two pieces instead of being in the direction of rolling, is cross wise'thereto, and when the operator passes such a pack through the rolls of'his finishing mill the slight crosswise hump in the pack where the same issome thou-, sandths of an inch thicker than elsewhere, the pack will curl transversely or else the component parts will be welded to each other or I have found that when rolling in fours that is to say when a pack is to be finished with four pieces of continuously rolled sheeted material with a cross sectional slight convexity in each piece of material, a method of procedure can be followed which will permit of rolling the material transversely to the convexity lines thereof.

In following my process in its preferred form, I will cut from a long piece of sheeted material of say around .12 of an inch in thickness, four pieces of like length, which length will be that of the width of the desired finished product. The pieces are matched and heated in a suitable furnace, and all delivered at once to the roller.

The roller divides the pack into two packs of two pieces each and rolls the pairs so formed, one pair at a time, through the mill, with the catcher passing one pair over the rolls while the other pair is being passed between them.

The pairs being relatively short in the direction of rolling as compared to their wide, and

width, can be reduced say around forty perf so controlled by the use of the screw, and the application of hot or cold blasts thereto, to

. shape the individual pairs into convex shape at right angles to the convexity in the original material, and reduce the then transverse convexity to a minimum.

I am able to do this, as I understand it, because the piling up of two pieces which are quite short in the direction of rolling, and thick enough and hot enough to shape themselves to the mill, will permit the handling of convex pack forming material without rolling in the direction of convexity.

As soon as the pairs have been somewhat reduced in thickness and given a thick center extending in to the direction of rolling, they are brought together by the roller, and

I finished by a series of passes in four thicknesses.

In following my process the continuous rolling should be regulated so that the convexity of the finished sheeted material will not be much more than a few thousandths depending upon the width of the material in the continuous mill. They must also be considerably narrower when out to form the pack, than they are long, or regarding it from' the point of view of the roller, the pairs during their rolling must be considerably shorter in the direction of rolling than they are wide, as otherwise the flexibility of the material will be such that it will curlup during the preliminary or shaping passes.

The thickness of the sheeted continuously rolled material is not critical in my process although it should not be too thin, and if too thick, it would not be practical to finishfirst in pairs and'then' in fours without an intermediate heating.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1 A process for finishing on one mill sheeted material rolled on another mill which has a cross sectional convexity in the direction of previous rolling, which consists in forming packs of fours of the said material, same being heatedg' then rolling pairs of the heated fours as units under and over in a direction transverse to the direction of the former continuous rolling and finally without reheating,

matching the reduced pairs and rolling in fours.

WILLIAM STRINGI-IAM. 

